Cooperative communication techniques with physical layer network coding

The main objective of this thesis is to analyze and develop practical cooperative communication techniques with physical layer network coding (PLNC) for wireless communciation systems. It is aimed to show that PLNC is effective and simple techniques for various wireless systems. It provides network throuhgput to be doubled while the BER performance is almost same as one-way traditional network?s performance. The first two systems that are discussed and simulated, are PLNC systems in 3-node and multi-node network where each user has symmetric at all angles such as lengths of information, modulation schemes, vice versa. The mapping algorithm is developed and tested for multi-node network where more than one relay exist. The next discussed system asymmetric PLNC system in which users have different length of information so they should use different modulation schemes. The mapping operation at relay is critical for the performance of system so the proper mapping algorithm is found and applied to the system. The simulation results of all systems which are investigated under AWGN and Rayleigh fading channels, show that the network throughput of PLNC system is doubled for acceptable BER performance as traditional network. The last discussed system contains orthogonal frequency division multiplexing (OFDM) technique which is good solution for high data rate transmission. OFDM is added to the proposed PLNC system and it is analyzed and evaluated under Rayleigh fading and Ricean fading channels. The outputs of simulation shows that OFDM can be implemented into PLNC system and the network throughput can be more improved. The different cooperation techniques, Decode&Forward (DF), Denoise&Forward (DNF), Amplify&Forward?s (AF) are also discussed and compared in this thesis.